Create Your Garden

Asclepias fascicularis (Narrowleaf Milkweed)

Narrowleaf Milkweed, Narrow Leaf Milkweed, Mexican Whorled Milkweed

Asclepias fascicularis, Narrowleaf Milkweed, Narrow Leaf Milkweed, Mexican Whorled Milkweed, Pink flowers, Lavender Flowers

Asclepias fascicularis (Narrowleaf Milkweed) is a flowering perennial boasting attractive clusters, 4-5 in. across (10-12 cm), of lavender and white, starry flowers from early summer to fall. Flowers are a great source of nectar for bees, butterflies, hummingbirds, and other pollinating insects. The blooms occur on upright, thin stems clad with long, narrow, pointed leaves. They give way to smooth seed pods in the fall, which look great in dried flower arrangements. When the seed pods open, they reveal seeds with long, silvery-white, silky hairs. Adaptable to high or low water, heat, and all types of soils (including clay), this is one of the easiest and fastest milkweeds to establish – A great choice for the flower garden and for natural settings. Milkweed plants are critical to monarch butterflies‘ survival, whose population in North America has plummeted by 90% in the last 20 years. By planting milkweed in your own garden, you can help reverse the fortune of these beautiful insects!

Milkweed plants belong to the Apocynaceae family, which includes other flowering plants such as oleander, hoya, plumeria, and the desert rose.

  • Grows up to 1-3 ft. tall (30-90 cm) and 12 in. wide (30 cm). May self-seed if seed pods are not removed prior to splitting open.
  • Thrives in full sun in dry to medium well-drained soils. Does well in poor, dry, gravelly soils. Drought tolerant.
  • Low maintenance, this perennial plant is generally pest and disease free. Deer resistant.
  • Perfect for sunny borders, cottage gardens, butterfly gardens, and prairies or naturalized areas.
  • Milkweeds contain cardiac glycosides, naturally occurring drugs that increase the force of heart contraction and have been used to treat heart conditions. The cardiac glycosides are potentially poisonous to humans. But they pose the most danger to grazing animals. However, it should be noted that not all milkweed species are equally toxic. Among the most toxic are Asclepias labriformis (Labriform Milkweed), Asclepias subverticillata (Western Whorled Milkweed), Asclepias eriocarpa (Woolypod Milkweed) and Asclepias fascicularis (Mexican Whorled Milkweed).
  • Toxic to dogs, toxic to cats, toxic to horses.
  • Native to North America
  • Got questions about milkweed? We have the answers!

Grow Milkweed, Save Monarch Butterflies: A Step-by-Step Guide


By providing the right growing conditions, you can enjoy healthy and vibrant milkweed in your garden while supporting pollinator populations.

Requirements

Hardiness 6 - 10
Climate Zones 3, 3A, 3B, 7, 8, 9, 10, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Perennials
Plant Family Apocynaceae
Genus Asclepias
Common names Milkweed, Narrowleaf Milkweed
Exposure Full Sun
Season of Interest Summer (Early, Mid, Late), Fall
Height 1' - 3' (30cm - 90cm)
Spread 9" - 1' (23cm - 30cm)
Spacing 12" (30cm)
Maintenance Low
Water Needs Low, Average
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Showy
Native Plants United States, Southwest, Rocky Mountains, Pacific Northwest, California, Oregon, Washington, Idaho, Nevada, Utah
Tolerance Drought, Deer, Dry Soil, Rocky Soil
Attracts Bees, Butterflies
Garden Styles Informal and Cottage, Prairie and Meadow
How Many Plants
Do I Need?
Explore Great Plant Combination Ideas
Asclepias (Milkweed)
Not sure which Asclepias (Milkweed) to pick?
Compare Now

Alternative Plants to Consider

Asclepias eriocarpa (Woollypod Milkweed)
Asclepias subulata (Rush Milkweed)
Asclepias perennis (Aquatic Milkweed)
Asclepias cordifolia (Heartleaf Milkweed)
Asclepias linaria (Pine-Needle Milkweed)
Asclepias quadrifolia (Fourleaf Milkweed)

Recommended Companion Plants

Mimulus aurantiacus (Bush Monkey Flower)
Ceanothus (California Lilac)

Find In One of Our Guides or Gardens

Curious About Milkweed? Here Are the Answers You’re Looking For
Milkweed: Is It Right for Your Garden? Pros & Cons
Top 70 Summer Flowers to Brighten Your Garden and Home
Desert Flowers: Bringing Color to Dry Gardens
50 Summer Wildflowers: Bright Blooms for Your Garden
50 Wildflowers that Thrive in Sun
50 Pink Wildflowers for Every Garden
50 Purple Wildflower to Brighten Your Garden
50 California Wildflowers: From Desert Blooms to Coastal Gems
50 Colorado Wildflowers to Know and Love
50 Texas Wildflowers to Brighten Your Garden
54 Orange Flowers To Brighten Up Your Garden with Bold Blooms
42 Green Flowers for Your Garden or Bouquets
42 Best Perennial Flowers and Plants to Brighten Your Garden Every Season
How to Create an Enchanting Butterfly Garden
For the Love of Butterflies: Best Flowers to Attract them to Your Garden
6 Reasons You Should Create a Butterfly Garden
Grow Milkweed, Save Monarch Butterflies: A Step-by-Step Guide
Asclepias (Milkweed)
Monarch Nectar Plants for Louisiana
Monarch Nectar Plants for Northern California
Monarch Nectar Plants for Arkansas
Monarch Nectar Plants for Kansas
Monarch Nectar Plants for Oklahoma
Monarch Nectar Plants for Texas
Monarch Nectar Plants for Colorado
Monarch Nectar Plants for Alabama
Monarch Nectar Plants for Georgia
Monarch Nectar Plants for South Carolina
Monarch Nectar Plants for Tennessee
Monarch Nectar Plants for Kentucky
Monarch Nectar Plants for Mississippi
Monarch Nectar Plants for Florida
Monarch Nectar Plants for New Mexico
Monarch Nectar Plants for Arizona
Monarch Nectar Plants for Michigan
Monarch Nectar Plants for West Virginia
Monarch Nectar Plants for New Jersey
Monarch Nectar Plants for Delaware
Monarch Nectar Plants for Maryland
Monarch Nectar Plants for Virginia
Monarch Nectar Plants for North Carolina
Monarch Nectar Plants for Pennsylvania
Monarch Nectar Plants for New-York
Monarch Nectar Plants for Maine
Monarch Nectar Plants for Ohio
Monarch Nectar Plants for Wisconsin
Monarch Nectar Plants for Minnesota
Monarch Nectar Plants for Indiana
Monarch Nectar Plants for Illinois
Monarch Nectar Plants for Missouri
Monarch Nectar Plants for Iowa
Monarch Nectar Plants for Nevada
Monarch Nectar Plants for Utah
Monarch Nectar Plants for Oregon
Monarch Nectar Plants for Idaho
Monarch Nectar Plants for Washington
Monarch Nectar Plants for Montana
Monarch Nectar Plants for Nebraska
Monarch Nectar Plants for North Dakota
Monarch Nectar Plants for South Dakota
Monarch Nectar Plants for Wyoming
Monarch Nectar Plants for Massachusetts
Monarch Nectar Plants for New Hampshire
Monarch Nectar Plants for Rhode Island
Monarch Nectar Plants for Connecticut
Monarch Nectar Plants for Vermont
50 Native Wildflowers for North Carolina
Save Monarch Butterflies with these Milkweed Plants
While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
Buy Plants

Requirements

Hardiness 6 - 10
Climate Zones 3, 3A, 3B, 7, 8, 9, 10, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Perennials
Plant Family Apocynaceae
Genus Asclepias
Common names Milkweed, Narrowleaf Milkweed
Exposure Full Sun
Season of Interest Summer (Early, Mid, Late), Fall
Height 1' - 3' (30cm - 90cm)
Spread 9" - 1' (23cm - 30cm)
Spacing 12" (30cm)
Maintenance Low
Water Needs Low, Average
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Showy
Native Plants United States, Southwest, Rocky Mountains, Pacific Northwest, California, Oregon, Washington, Idaho, Nevada, Utah
Tolerance Drought, Deer, Dry Soil, Rocky Soil
Attracts Bees, Butterflies
Garden Styles Informal and Cottage, Prairie and Meadow
How Many Plants
Do I Need?
Explore Great Plant Combination Ideas
Asclepias (Milkweed)
Not sure which Asclepias (Milkweed) to pick?
Compare Now

Gardening Ideas

Plant Calculator

How many Asclepias fascicularis (Narrowleaf Milkweed) do I need for my garden?

Input your garden space dimensions

Your Shopping List

Plant Quantity
Asclepias fascicularis (Narrowleaf Milkweed) N/A Buy Plants

Please Login to Proceed

You Have Reached The Free Limit, Please Subscribe to Proceed

Subscribe to Gardenia

To create additional collections, you must be a paid member of Gardenia
  • Add as many plants as you wish
  • Create and save up to 25 garden collections
Become a Member

Plant Added Successfully

You have Reached Your Limit

To add more plants, you must be a paid member of our site Become a Member

Update Your Credit
Card Information

Cancel

Create a New Collection

Sign Up to Our Newsletter

    You have been subscribed successfully

    Join Gardenia.net

    Create a membership account to save your garden designs and to view them on any device.

    Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas.

    Join now and start creating your dream garden!

    Join Gardenia.net

    Create a membership account to save your garden designs and to view them on any device.

    Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas.

    Join now and start creating your dream garden!

    Find your Hardiness Zone

    Find your Heat Zone

    Find your Climate Zone